According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a business in fossil fuels, address: Rapenburgerstraat 163 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives
In addition, a Jokos file (number 3788) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.